题目内容

光纤接续的仪器是

A. OTDR
B. 万用表
C. 光纤熔接机
D. 可视红光源

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PON作为一只接入网技术，定位通俗说法指最后（）公里

A. 1
B. 2
C. 3
D. 5

OTDR使用那两种原理

A. 瑞丽散射和菲涅尔反射
B. 折射和反射
C. 散射和色散
D. 散射和全反射

【段落翻译】Remember, living green really does make our life different! It is a healthy choice both for us and for our planet. In the long run, small changes we make in our life will have a great impact on the planet. As the old saying goes, no one can do everything, but everyone can do something! With the idea of living green every single day, our Green Year is getting started.

柴油的十六烷值反映其[ ]。

A. 挥发性能
B. 抗爆性能
C. 安全性能
D. 着火性能